Game engine supporting many 3D/2D formats and graphic effects
Cerberus Content Management System
Grief - BRIEF clone
Web IDE in single HTML file
3rd Party Video Games Developer: MetalManGames, titles of games
Homebrew save management, editing tool and memory trainer for Horizon
2D Game Engine
Game backup loader for Wii and vWii
3D-Accelerated open-source DOOM engine
Multi-platform game engine similar to old Megaman with a stage editor
PSP Debug Bash and Multi-Environment Shell
MicroLua brings Lua on the Nintendo DS for easy programming
Very Powerfull Crossplatform Qt Based Music Note Editor[Still Planing]
3D Engine technology with partial tools developing kit.